I attend these appeals as a panel member. I want to emphasize the need for unemotional, genuine reasons for the appeal together with paperwork which helps to prove your arguments.
e.g. No good saying "he cant climb stairs" without a doctors note about that.
I feel for all the parents in this situation but we do have criteria to stick to and we cannot make extra places in a very popular school.
Don't assume that just because you appeal you must get a place: more appeals fail than succeed.
We try to be informal and are aware that it is a difficult time for you but there is a structured procedure to go through.
Read all the advice in leaflets and online before presenting your case.